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diff --git a/third_party/libwebrtc/api/crypto/frame_encryptor_interface.h b/third_party/libwebrtc/api/crypto/frame_encryptor_interface.h
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+/*
+ *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef API_CRYPTO_FRAME_ENCRYPTOR_INTERFACE_H_
+#define API_CRYPTO_FRAME_ENCRYPTOR_INTERFACE_H_
+
+#include "api/array_view.h"
+#include "api/media_types.h"
+#include "rtc_base/ref_count.h"
+
+namespace webrtc {
+
+// FrameEncryptorInterface allows users to provide a custom encryption
+// implementation to encrypt all outgoing audio and video frames. The user must
+// also provide a FrameDecryptorInterface to be able to decrypt the frames on
+// the receiving device. Note this is an additional layer of encryption in
+// addition to the standard SRTP mechanism and is not intended to be used
+// without it. Implementations of this interface will have the same lifetime as
+// the RTPSenders it is attached to. Additional data may be null.
+class FrameEncryptorInterface : public rtc::RefCountInterface {
+ public:
+  ~FrameEncryptorInterface() override {}
+
+  // Attempts to encrypt the provided frame. You may assume the encrypted_frame
+  // will match the size returned by GetMaxCiphertextByteSize for a give frame.
+  // You may assume that the frames will arrive in order if SRTP is enabled.
+  // The ssrc will simply identify which stream the frame is travelling on. You
+  // must set bytes_written to the number of bytes you wrote in the
+  // encrypted_frame. 0 must be returned if successful all other numbers can be
+  // selected by the implementer to represent error codes.
+  virtual int Encrypt(cricket::MediaType media_type,
+                      uint32_t ssrc,
+                      rtc::ArrayView<const uint8_t> additional_data,
+                      rtc::ArrayView<const uint8_t> frame,
+                      rtc::ArrayView<uint8_t> encrypted_frame,
+                      size_t* bytes_written) = 0;
+
+  // Returns the total required length in bytes for the output of the
+  // encryption. This can be larger than the actual number of bytes you need but
+  // must never be smaller as it informs the size of the encrypted_frame buffer.
+  virtual size_t GetMaxCiphertextByteSize(cricket::MediaType media_type,
+                                          size_t frame_size) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // API_CRYPTO_FRAME_ENCRYPTOR_INTERFACE_H_